Straighten out Nutcracker's cast (8)
I believe the answer is:
untangle
'straighten' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for untangle that I've seen before include "Sort out" , "Extricate" , "Make free from confusion" , "Make free from disorder" , "'Unpick, unravel (8)'" .)